Susan Walsh, Associated PressPharmaceutical chief Martin Shkreli arrives on Capitol Hill in Washington, Thursday, Feb. 4, 2016, to appear before the House Committee on Oversight and Reform Committee hearing on his former company's decision to raise the price of a lifesaving medicine. Shkreli refused to testify before U.S. lawmakers who excoriated him over severe hikes for a drug sold by a company that he acquired.

Much-despised drug CEO Martin Shkreli smirked and laughed at members of Congress while refusing to answer their questions Thursday, later calling them “imbeciles.”

Shkreli vented his dislike on Twitter after refusing to testify before a House Committee about his infamous decision to increase the price of a lifesaving drug by 5,000 percent. He invoked his Fifth Amendment right to avoid self-incrimination, and smirked and laughed at representatives who wanted to question him.

“I don’t think I’ve ever seen the committee treated with such contempt,” Representative John Mica, a Florida Republican, said after Shkreli left the room, according to The New York Times.

As CEO of Turing, the 32-year-old drew international outrage by raising the price of Daraprim, which helps treat malaria and HIV, from $13.50 to $750 per pill.

Separately, Shkreli was arrested on fraud charges related to his time as a hedge fund manager and as head of his former company, Retrophin.

See his tweets below:

Hard to accept that these imbeciles represent the people in our government.

San Francisco prosecutors said Thursday that they will not charge officers in two shooting deaths, including the killing of a black man that led to citywide protests three years ago and federally recommended police reforms.

Law enforcement officials say Harvey Weinstein is expected to surrender to authorities Friday morning to face criminal charges in a months-long investigation into allegations that he sexually assaulted women.